Method and apparatus for encoding a contour image of an object i

Details Method and apparatus for encoding a contour image of an object i Method and apparatus for encoding a contour image of an object i

1996-09-23

1998-08-11

Boudreau, Leo

Image analysis

Image compression or coding

Contour or chain coding

382243, G06K 900

Patent

active

057938938

ABSTRACT:
An apparatus for encoding a contour of an object determines a number of vertex points based on a polygonal approximation to the contour. A set of approximation errors calculated at a predetermined number of sample points on each line segment between two adjacent vertex points is transformed to obtain a corresponding set of transform coefficients. The apparatus converts, in response to a masking range designation signal corresponding to each line segment, a part of the set of transform coefficients to zeros and produces a set of masked transform coefficients corresponding thereto. The set of masked transform coefficients is quantized and encoded to be transmitted through a transmitter.

REFERENCES:
patent: 4777651 (1988-10-01), McCann et al.
patent: 5295201 (1994-03-01), Yokohama
Y. Sato, 1992, Pattern Recognition 25: 1535-1543, pp. 1535-1543, Dec. 1992, Oxford, GB.
Biswas et al., 1988, IEEE Transactions on Systems, Man, and Cybernetics 18: 1051-1066, Nov.-Dec. 1988, "Approximate Coding of Digital Contours", NY, USA.

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